Timer for electric welding-machines.



J. A. HEANY.

TIMER FOR ELECTRIC WELDING MACHINES.

APPLICATION FILED MAY 17, 1912 1,050,827. Patented Jan.21, 1913 lull]:

ave/M20; W in mm jazz j $2M; 776% JOHN ALLEN HEANY, OF- WASHINGTON, DISTRICT OF COLUMBIL TIMER FOIB ELECTRIC WELDING-MACHINES.-

Specification of Letters Patent.

Application filed Kay 17, 1912. Serial No. 697,914.

tem or arrangement for carrying out my invention; and Fig. 2 is a perspective view showing one form of adjustable timing contact.

The object of this invention is to provide simple means for automatically stopping the weldin action after it has been started byv manna y bringing the electrodes together upon the work or the parts of the work together, accordin to the kind of welding machine the inventlon is applied to, the means em rlcge ed for thus stopping the welding action ing so constructed that the welding action may be allowed to continue any predetermined length of time within the limits of the apparatus, this length of time being adjusted to the particular character of work the machine is adapted for performing. In this way I eliminate entirely the personal judgment of the o rator and thus save greatly in the loss of time and consequently matemally increase the speed of the machine.

My invention enables the time during which thewelding action continues to be reduced to a point much below that which. is humanly possible even though the operator should stop thewelding action as quickly as possible after commencing, whereby I am enabled to avoid lar e heat loss.

M invention furt er prevents loss resultom burning at the electrodes. have illustrated in the accompanying drawing one manner of carrying out my invention but it will be understood that the s irit of the invention is much broader than t e particular construction and arrangement shown and that therefore I may depart therefrom to a large degree without departing from the scope of the claims ap ended hereto.

. Y the drawing, a designates the two electr es of a well known type of electric welding machine; I) the secondary or low tension side of the usual transformer connected to said electrodes; 0 the primary .or high tension side of the transformer. The elec trodes and the low tension side I) are connected to the conductors d of the line circuit (which line circuit is of course connected to the usual source of electric energy) by a circuit e in which ,is included a relay 7 Whose armature g is included in a second relay circuit it, this armature 9 being adjusted to normally close the circuit h. This relay circuit h is connected to theline circuits in the same manner as the relay circuit e and included in it is a relay 2', whose armature j is included in a third relay circuit is also connected to the line circuit. In one branch of this circuit k is included a relay m whose armature n forms part of the primary or high tension circuit 0. This armature n is adjusted to normally hold this circuit 0 open. In the other branch of the circuit k is a contact plate Z which is so placed that when the armature j is released by demagnetization of the relay 2' said armature j will swing across the face of said plate Z and make contact therewith the full length of the plate. a

When no current is flowing through the line circuit and the electrodes at are separated or adjusted to inactive osition,'the arma ture g normally closes circuit E, armature j is normally pulled over to a posltion beyond and out of contact with plate Z, and armature n is pulled down to normally keep circuit 0 open at that point. When the switch Patented Jan. 21, 1913.

in the line circuit is closed to put the machine in readiness for operation armature 9 remains in its closed position since the inductance in the low tension coil 6 is suflicient to prevent sufficient current passing through relay f to actuate said armature, but armature y will be attracted to its relay magnet and thus hold circuit is open between contact plate Z and said armature j. When armature j is thus attracted to its magnet it will contact with plate Z during its passage over the face thereof and the armature n will thus be attracted to the ma et of relay m and close circuit 0 of the high tension side of the transformer, but this temporary closing of this circuit 0 cannot produce any derangement of the apparatus, especially in view of the fact that the operator has not yet brought the electrodes (1 into operative position.

'The apparatus will now be in position for a welding operation. After the work is adjusted and the operator moves the electrodes 1nto welding position, the current in the re lay circuit 6 will be shunted through the electrodes and the work therebetween and thus cut out the low tension coils b of the transformer, whereupon a suflicient electro motor force will be caused to pass through relay 7 to actuate its armature g and thus break circuit h and release armature j. This armature j will thereupon sweep across the face of contact plate Z and come to rest beyond it. During the time the armature j is in contact with plate Z the armature n will be attracted by its magnet in relay m and thus close circuit 0, and the closing of this circuit 0 sends the alternating line current through the high tension side of the transformer and thus induces electro motive force in the secondary or low tension side I). It will thus be seen that the welding action continues only so long as the armature j is in actual'contact with the contact plate Z, since the instant the armature j passes off the contact plate Z the hi h tension circuit 0 will be broken at a an the welding action will cease. Since therefore the time of contact vention. In Fig. 2 the timing contact Z is,

shown constructed of apair of bars arranged side by side and rendered adjustable by the use of a threaded bolt 8 connecting lugs. at the opposite ends of said bars, whereby the length of the contact may be varied. In this figure is also shown one way in which upon the return stroke of the timing lever {I may avoid closing the circuits is and 0;

do this by providing the upper end of the lever j with a spring p whose upper end wipes the under side of contact Z as the lever y swings back and forth, and on one side of the end of this spring p I fasten a block 9 of insulation material, whereby when the lever is attracted by the core of the magnet 71 the insulation Q will prevent the contact spring p from'coming in contact with the contact plate Z. Having thus described my invention, what ing machine, of electrically controlled means for determining the length of time during which the weldin action continues.

3. In combination with an electric welding machine, of electrically controlled means for determining the length of time during which the Welding action continues, said means embodying a pair of contacts one of which is adjustable as to length of contacting surface.

4. In combination with an electric welding machine, of electrical means for stopping the welding action at a predetermined time after the welding action has been started'manually, said means embodying a relay circuit connected to the line circuit.

5. In combination with an electric welding machine, of electrical means for stopping the welding action at a predetermined time after the welding action has been started manually, said means embodying a lurality of relay circuits connected to the ine circuit.-

6. In combination with an electric welding machine, of electrical means for stopping the welding action at a predetermined time after the welding actlon has been started manually, said means embodying a plurality of relay circuits connected to the line circuit, one of these relay circuits embodying means for automatically closing and o ening the high tension circuit of the trans ormer after the electrodes of the machine are brought into action.

7. In combination with an electric welding machine embodyin a line circuit and transformer and. weldlng electrodes, of a relay circuit connecting the line circuit to the electrodes and the low tension side of the transformer, and means whereby when the electrodes are brought into action to commence the welding operation the high tension circuit will be closed and held closed I an appreciable length of time and then automatically opened.

8. The combination with an electric welding machine embodying a transformer and electrodes, of electrical means for determining the length of time during which the welding action continues said means cooperating with the trans ormer.

9. In combinationwith an electric welding machine, of meansjgfor electrically controlling the time durin'g which the welding action continues, ei'nbo ying means whereby the act of mechanically bringing'the electrodes into opera and stops the electric welding action.

10. In combination with an electric welding machine, of electrical means for stopping the welding action at a predetermined time after the welding action has been started manually, said meansembodying a relay circuit.

11. In combination with an electric welding machine, of electrical means for stoptive position both starts started manually, said means embodying a ping the welding action at a gi edeterminedv time after "the welding action has been plurality of relay circuits. 15

In testimony whereof I hereunto afix my signature in the presence of two witnesses.

v JOHN ALLEN HEANY. Witnesses:

FnnnB. MGLAR N, B. I. BRIDGES. 

